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Preparation method of rare earth permanent magnet

A technology of rare earth permanent magnets and magnets, applied in the direction of magnetic objects, inductors/transformers/magnets manufacturing, magnetic materials, etc., can solve the problem of affecting the effect of Hcj improvement, it is difficult to ensure the repeatability and process stability of the diffusion process, and there is no preparation of magnet powder Put forward specific requirements and other issues to achieve the effect of wide range of phase-forming elements, improved interaction, and less reduction

Active Publication Date: 2014-10-22
BEIJING ZHONG KE SAN HUAN HI TECH +1
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AI Technical Summary

Problems solved by technology

[0005] The above methods can improve H to a certain extent cj , and the surface state of its powder and magnet will very sensitively affect the H cj However, none of the above patents have specific requirements on the state of the magnet and the preparation of the powder
As we all know, if the Dy or Tb compound is diffused into the magnet by the diffusion method, if there is no special requirement on the activity and surface state of the powder, it is very difficult to ensure that the heavy rare earth can diffuse into the magnet, and it is also difficult to ensure the reliability of the diffusion process. Repeatability and process stability, it is difficult to industrialize the preparation to stably improve H cj the magnet

Method used

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  • Preparation method of rare earth permanent magnet
  • Preparation method of rare earth permanent magnet
  • Preparation method of rare earth permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0062] First, the sintered NdFeB blank magnet without tempering treatment is processed into a magnetic sheet with a size of Φ10*3mm, and the magnetic sheet is subjected to conventional degreasing and pickling in 5% (volume percentage) nitric acid, and then Ultrasonic cleaning and drying, the magnetic sheet is stored under the protection of inert gas.

[0063] Prepare the infiltrating material powder to be coated, the powder is prepared according to the following procedures:

[0064] Raw materials are batched according to the following weight ratios. The range of ingredients is: Nd: 15wt%, Pr: 12wt%, Dy: 30wt%, Fe: 42wt%, Cu: 1wt%; put the prepared raw materials into the vacuum medium frequency induction Furnace for melting and casting, the thickness of the casting alloy ingot is about 10mm, and the oxygen content of the alloy ingot is 200ppm;

[0065] In the hydrogenation furnace, the alloy ingot is hydrogenated and crushed, only hydrogen is absorbed without dehydrogenation t...

Embodiment 2

[0091] First, the sintered NdFeB blank magnets that have not been tempered are processed into magnetic sheets with a size of Φ10mm*10mm, and the magnetic sheets are subjected to conventional degreasing and pickling in 4% nitric acid and ultrasonic After cleaning and drying, the disks are stored under the protection of inert gas.

[0092] Prepare the infiltration material powder to be coated. The powder is prepared by the following process, and the raw materials are batched according to the following weight ratio. The composition range of the batching is: Dy: 60wt%, Co: 40wt%; Put it into a vacuum intermediate frequency induction furnace for smelting, and use the quick-setting sheet technology to prepare sheets with an average thickness of 0.3mm and an oxygen content of 60ppm.

[0093] Hydrogenation crushing is carried out in the hydrogenation furnace, only hydrogen is absorbed without dehydrogenation treatment, and the quick-setting flakes of hydrogenation crushing are simply ...

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Abstract

A preparation method of a rare earth permanent magnet includes a magnet blank preparing procedure which does not include tempering, a penetrant material coating procedure and a thermal processing procedure. The magnet blank preparing procedure refers to magnet blank preparing through material preparing, alloy smelting, powder crushing, forming and sintering. The penetrant material coating procedure includes preparing penetrant material powder, turning the penetrant material powder into coating solution, coating the magnet blank in the coating solution, and the like. The method has the advantages that rare earth intermetallic compounds are used as diffusion materials, the rare earth intermetallic compounds are stable in phase and component, easy to crush and wide in phase element range, and the phase elements can be adjusted according to magnet performance to form the components of the rare earth intermetallic compounds; the boundary characteristics of crystal boundary and interaction of the crystal boundary and main phase crystal particles can be improved, the internal coercivity of sintered NdFeB magnet is increased, and few residual magnetism and maximum magnetic energy product reduction is achieved.

Description

technical field [0001] The invention relates to a preparation method of a rare earth permanent magnet, in particular to a method that can improve the intrinsic coercive force H of a sintered NdFeB magnet. cj The manufacturing method, especially refers to the method of improving the inherent coercive force of the sintered NdFeB magnet semi-finished product. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials with intermetallic compounds composed of different rare earth elements and transition metal elements (Fe, Co, Ni, etc.) as the main phase. Since its invention in the 1960s, rare earth permanent magnet materials have developed rapidly and have been widely used in many fields, becoming an important basic functional material for contemporary new technologies, especially in the field of permanent magnet motors. . Today, rare earth permanent magnet motors have covered the main types of stepper motors, brushless motors, servo mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053
Inventor 赵玉刚胡伯平张瑾陈国安饶晓雷钮萼陈治安贾敬东金国顺
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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